蹄盖蕨科的系统发育: 叶绿体DNA trnL-F区序列证据

蹄盖蕨科Athyriaceae是蕨类植物中一个复杂的大科，由于属间关系不甚清楚，该科分类系统还有一些问题，比如新蹄盖蕨、拟鳞毛蕨属、假冷蕨属、肠蕨属、短肠蕨属和菜蕨属的系统位置常有争议。根据蹄盖蕨科34种植物和3种外类群植物的叶绿体DNA trnL-F区序列建立了系统发育树，结果显示:1.trnL_F区序列分析的结果与rbcL基因序列分析的结果几乎一致。2.新蹄盖蕨属Neoathyrium Ching&Z.R.Wang不应成立，该属应与角蕨属Cornopteris Nakai合并。3.假冷蕨属Pseudo

Phylogeny of the Athyriaceae: evidence from chloroplast trnL-F region sequences

The Athyriaceae are a large and complex family. The phylogenetic relationships among the genera in the family are not well understood, and the systematic positions of Neoathyrium crenulatoserrulatum , Kuniwatsukia , Pseudocystopteris , Diplaziopsis , Allantodia and Callipteris have long been controversial. Nucleotide sequences of the chloroplast trn L-F region from 34 species of the Athyriaceae and three species in two other families were analyzed to gain insights into the intergeneric relationships. The phylogenetic relationships of the genera were inferred using the neighbor-joining and maximum parsimony methods, and both methods produced largely congruent trees. These trees reveal that: (1) the results of the trn L-F region sequence analyses and those of the rbc L gene sequence analyses are largely congruent; (2) Neoathyrium crenulatoserrulatum (Makino.) Ching & Z. R. Wang should be transferred to Cornopteris Nakai; (3) Pseudocystopteris Ching and Kuniwatsukia Pic. Serm. should be placed in Athyrium Roth; (4) Diplaziopsis C. Chr. belongs to the Diplazium clade; (5) Allantodia R. Br. emend. Ching, Callipteris Bory should be included in Diplazium Sw.; (6) Athyriaceae may better be divided into five subfamilies: Cystopterioideae, Athyrioideae, Deparioideae, Diplazioideae and Rhachidosorioideae.